Dishwasher



1943. A. w. DUNHAM DISHWASHER Filed 001:. 24, 1941 '2 Sheets-Sheet 2small, sturdy, and inexpensive.

and benefits will be disclosed in the following Patented Jan. 5, 1943DISHWASHER Ansel W. Dunham,-Red Oak, Iowa. assignor oi thirty-one percent to Dean Hole, Chicago, Ill.

Application October 24, 1941, Serial No. 416,317

4 Claims.

This invention relates to dishwashers of the type usually employed inrestaurants, or the like, where there is a demand for dish washing, in alarge capacity, in a machine occupying a relatively small, compactspace.

The ideal dishwasher for this purpose should be rectangular in shape tobest fit into congested spaces and to utilize the cheaper conventionalrectangular wire dish baskets. It should also be so constructed as to berelatively independent of plumbing conditions, such as hot water supply,and water and sewer connections. Although the washer should be capableof operating successfully with a minimum amount of water, it must be soconstructed and arranged that the rinsing operations are performed withhot, clean water which is later utilized as wash water.

It is the particular object of this invention to provide a dishwasherembodying all of the above desirable characteristics in a constructionthat is Other objects descriptions and drawings, in which:

Fig. 1 is a broken, i-ront, perspective view showing the generalarrangement of the parts under operating conditions;

Fig. 2 is a. top plan view of the dishwasher shown in Fig. 1 with thelid open; and

Fig. 3 is an enlarged, broken, sectional elevational view as wouldappear on the section line 3-3 of Fig. 2.

Now referring to the drawings; and at the outset particularly to Fig. 1.my dishwasher has an outside casing Ill in which a tank ll attached toan inside casing i2 is mounted. The inside casing I! has two verticalwater ducts l3 and i3 located on the outside of the casing, taking waterfrom the lower ends of the ducts through the sections l5 and dischargingit from the upper ends of the ducts through the sections I! in dualcascading currents that practically cover the entire inner area of thecasing. As a matter of fact, the cross-sectional area of the casing isso covered by these cascading streams of water that it is necessary toprovide breather openings by the air ducts l4 and I4 located on the endsof the casing. These air ducts take air from the bottom of the casingthrough an opening l6 and discharge it through the top of the duct l8,where it leaves the outside casing through the air grills 19. The casingis covered by a hinged lid 20 to eflectively seal the casing when thewasher is in.

operation. I

Now referring to Figs. 2 and 3, I mount a pump by cap screws through themanifold flanges 24 and 24, as clearly shown inFig- 2. The mani- .headsare mounted on thrust washers 2! fold 2| has a central pump collar 22extending downward towards the bottom of the tank, and on the top of themanifold are two under-spray outlets 23. Mounted on the spray outlets 23are two spray heads 25 and 25' having angular spray jets 26 and 26'arranged to whirl the heads 25 and 25' by the reaction of the waterthrough the jets, asis well understood in the art. The spray and revolveon rinse pipes 28, as clearly shown in Fig. 3. The rinsepipes are sealedby packing glands 29 in the bottom of the tank, which serve not only toseal the pipe against leaks but also to hold the pipe firmly in setposition. On top of the spray. jets 25 and 25 are two-rinse spray heads30 and 30'. These heads also revolve on the pipes 28. being mounted bycap screws 3i and 3i and thrust washers 32. It will be readilyappreciated that the rinse spray heads are also designed to effect aswirling action, as is well understood in the art. Mounted in the pumpcollar 22 is a pump impeller 33 mounted on'a shaft 34 connected to themotor. This shaft is also sealedby a packing gland 35 which alsoefiectively acts as a bearing for the pump impeller. The space betweenthe pump collar 22 and the bottom of the tank ii is covered by a ringscreen 36 in order to screen off heavy material out of the pumpmanifold.

Again referring to Fig. 1, the impeller 33 is driven in a conventionalmanner by a motor 31 which also drives a discharge pump- 38 by the belttransmission 43. This discharge pump 38 takes wash water from the'bottomof the tank I l by the intake pipe 39 controlled by the valve 39' anddischarges it through the outlet connection 40, having facilities forattaching a hose 40'. This power discharge of wash water permits thewater to be delivered to any convenient place by means of a hoseattached to the connection 40".

Also mountedcn the bottom of the tank II is a conventional electricwater heater 4|. This water heater is equipped with a thermostat tomaintain water at any desired temperature and provides a ready supply ofhot'water regardless of the'hot water facilities available outside ofthe washer. The Water is taken into the heater 4| through a pipe 42,controlled by a conventional valve 42', and is discharged from theheater through the tubes 28 and the whirling rinse heads 30 and 30'. Itwill be noted that this is the sole manifold 2| in the bottom of theinner casing I2 inlet for wash water in the tank II and in normaloperation this water is used for rinsing the dishes first; thus therinsing operation is always accomplished with clean, hot water. Thedishes are stacked in conventional wire baskets l5 supported on innerbrackets 44. It will be understood that the dishes are usually stackedin the baskets awaiting the washer and when one basket of clean dishesis removed a basket of dirty dishes is inserted.

In order to appreciate the novel features of my washer, I desire toexplain that the dishes are continuously subjected to a very largevolume of water cascaded upon them from both sides by the pump 33. Atthe same time they are subjected to powerful intermittent sprays frombelow by the spray heads 25 as they are rotated by the reactive force ofthe water. This arrangement provides a very efiective means forthoroughly and quickly washing the dishes. When the washing operation iscompleted the dirty dish water is discharged by opening the valve 39,whereupon the dirty water is forcibly and quickly delivered to anyconvenient opening to the sewer. The dishes are now rinsed by openingthe valve 42 which permits hot, clean water to be sprayed over thedishes from the revolving heads 30 and 30'. This clean rinse water iscollected in the tank I l and used for subsequent washing operations.The basket of clean dishes is then removed and a basket of dirty dishesinserted in the washer and the operation repeated.

Having thus explained my invention, I now claim asnew:

1. In a dishwater, an outer cabinet, a casing within the cabinetincluding a wash water tank in the bottom of the casing, a pump manifoldmounted in the bottom of the casing, having dual side discharge outlets,dual top discharge outlets, and a central open impeller pump collarextending into the tank, wash water ducts on the sides of the casingsconnected to the side discharge outlets of the manifold arranged tocascade water from the tops of both sides of the casing over the entirecross-sectional area of the casing, air ducts on the ends of the casingarranged to permit air to be discharged from the bottom of the innercasing and to prevent the escape of wash water therewith, an impellerpump mounted within the collar or the manifold in the wash water tank,and revolving spray heads mounted on the dual manifold dischargeoutlets, the arrangement providing means to continuously cascade washwater from the top sides of the inner' casing and spray wash water fromthe bottom of the casing.

2. In a dishwasher, as described in claim 1, having dual rinse waterspray heads mounted over the wash water heads and clean rinse watersupply means connected to the rinse heads.

3. In a. dishwasher, as described in claim 1, having dual rinsing sprayheads mounted over the washing heads, rinse water pipes through thecenters of both pairs of heads providing pivot means for rotating theheads, and a clean water supply for the rinsing heads.

4. In a dishwasher, a tank having relatively high walls, a pump manifoldmounted in the bottom of the tank having dual side discharge outlets,dual top discharge outlets, and a central open impeller pump collarextending to a point adjacent the bottom of the tank, wash water ductson the sides of the tank connected to the side discharge outlets of themanifold and extending to the tops of both sides of the tank, ar rangedto cascade wash water over the inner cross-sectional area of the tank,air ducts on the ends of the tank arranged to permit air to bedischarged from a point above the bottom of the tank and extendingupwardly to prevent the escape of wash water therewith, an impeller pumpmounted 'within the collar of the manifold in the wash water tank, andrevolving spray heads mounted on the dual manifold discharge outlets,the arrangement providing means to continuously cascade wash water fromthe top sides of the tank and spray wash water from the bottom of thetank.

AN SEL W. DUNI-IAM.

